iranian president mahmoud ahmadinejad is speaking before the general assembly and it has become a tradition for him to set a wide ranging debate about what he says when he does address the assembly. if we get more details we'll bring them to you. that is a live look at what's happening awfully close to the u.n. >>> the interview twitter is waiting for. dick costello with julia boorstin speaking out on everything from mobile ads to going public. what he has to say when we come back. ♪ ♪ [ male announcer ] how do you engineer a true automotive breakthrough? ♪ you give it bold new styling, unsurpassed luxury and nearly 1,000 improvements. introducing the redesigned 2013 glk. see your authorized mercedes-benz dealer for exceptional offers through mercedes-benz financial services. powerful trading tools for all. like our all-in-one trade ticket. we put strategies, chains and positions all on one screen. start trading today with optionsxpress by charles schwab. >>> ever fins facebook went public they have been wondering what it means for twitter and julia sat down with the ceo at the headqu